SCX...C Series
Low cost compensated pressure sensors
FEATURES
· 0...1 to 0...150 psi
· Low cost
· Precision temperature
compensation
· Calibrated zero and span
· Small size
· Low noise
· High impedance for
low power applications
GENERAL DESCRIPTION
The SCX...C series sensors will provide a
very cost effective solution for pressure
applications that require operation over a
wide temperature range. These internally
calibrated and temperature compensated
sensors give an accurate and stable output
over a 0°C to 70°C temperature range. This
series is intended for use with non-corro-
sive, non-ionic working fluids such as air,
dry gases, and the like.
Devices are available to measure absolute,
differential, and gage pressures from 1 psi
(SCX01) up to 150 psi (SCX150). The ab-
solute (A) devices have an internal vacuum
reference and an output voltage proportio-
nal to absolute pressure. The differential
(D) devices allow application of pressure
to either side of the pressure sensing
diaphragm and can be used for gage or
differential pressure measurements.
The SCX devices feature an integrated cir-
cuit sensor element and laser trimmed thick
film ceramic housed in a compact nylon
case. This package provides excellent
corrosion resistance and provides isolation
to external package stresses. The package
has convenient mounting holes and pres-
sure ports for ease of use with standard
plastic tubing for pressure connection.
All SCX devices are calibrated for span to
within ±5 % and provide an offset (zero
pressure output) of ±1 mV maximum. These
parts were designed for low cost applica-
tions where the user can typically provide
fine adjustment of zero and span in extenal
Scale:
1 cm
½ inch
APPLICATIONS
· Medical Equipment
· Computer Peripherals
· Pneumatic Control
· HVAC
circuitry. For higher accuracies, refer to
the standard SCX series datasheet. If the
application requires extended temperature
range operation, beyond 0 to 70°C, two
pins which provide an output voltage pro-
portional to temperature are available for
use with external circuitry.
The output of the bridge is ratiometric to the
supply voltage and operation from any D.C.
supply voltage up to +20 V is acceptable.
Because these devices have very low
noise and 100 microsecond response time
they are an excellent choice for medical
equipment, computer peripherals, and
pneumatic control applications.
EQUIVALENT CIRCUIT
2
Vs
ELECTRICAL CONNECTION
1
+
-
1 2 3 4 5 6
Pin
Pin
Pin
Pin
Pin
Pin
1)
2)
3)
4)
5)
6)
Temperature output (+)
V
S
Output (+)
Ground
Output (-)
Temperature output (-)
3
5
Bottom view
6
Note:
The polarity indicated is for pressure applied to port B
(for absolute devices pressure is applied to port A
and the output polarity is reversed.)
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SCX...C Series
Low cost compensated pressure sensors
PRESSURE SENSOR CHARACTERISTICS
1
Standard pressure ranges
Part number
SCX01DNC
SCX05DNC
SCX15ANC
SCX15DNC
SCX30ANC
SCX30DNC
SCX100ANC
SCX100DNC
SCX150DNC
Operating pressure
0 - 1 psid
0 - 5 psid
0 - 15 psia
0 - 15 psid
0 - 30 psia
0 - 30 psid
0 - 100 psia
0 - 100 psid
0 - 150 psid
Proof pressure
20 psid
20 psid
30 psia
30 psid
60 psia
60 psid
150 psia
150 psid
150 psid
2
Full-scale span
1,3
Min.
17 mV
57.5 mV
85 mV
85 mV
85 mV
85 mV
95 mV
95 mV
85 mV
Typ.
18 mV
60 mV
90 mV
90 mV
90 mV
90 mV
100 mV
100 mV
90 mV
Max.
19 mV
62.5 mV
95 mV
95 mV
95 mV
95 mV
105 mV
105 mV
95 mV
Maximum ratings
(for all devices)
Supply voltage V
S
Common-mode pressure
Lead temperature (soldering, 4 seconds)
+20 V
DC
50 psig
250°C
Environmental specifications
(for all devices)
Temperature range
Compensated
Operating
Storage
Humidity limits (non-condensing)
0 to 70°C
-40°C to +85°C
-55°C to +125°C
0 to 99 %RH
COMMON PERFORMANCE CHARACTERISTICS
1
Characteristic
Zero pressure offset
Combined linearity and hysteresis
4
Temperature effect on span (0 to 70°C)
5
Temperature effect on offset (0 to 70°C)
5
Repeatability
6
Input impedance
7
Output impedance
8
Common-mode voltage
9
Response time
10
Long term stability of offset and span
11
Min.
-1.0
---
---
---
---
---
---
5.7
---
---
Typ.
0
±0.2
±0.4
±0.20
±0.2
4.0
4.0
6.0
100
±0.1
Max.
+1.0
±1.0
±2.0
±1.0
±0.5
---
---
6.3
---
---
Unit
mV
%FSO
%FSO
mV
%FSO
kΩ
kΩ
V
DC
µsec
mV
Specification notes:
1.
Reference conditions: Unless otherwise noted: supply voltage, V
S
= 12 V, T
A
= 25°C, common-mode line pressure = 0 psig,
pressure applied to port B. For absolute devices only, pressure is applied to port A and the output polarity is reversed.
2.
Maximum pressure above which causes permanent sensor failure.
3.
Span is the algebraic difference between the output voltage at full-scale pressure and the output at zero pressure. Span is
ratiometric to the supply voltage.
4.
See Definition of Terms. Hysteresis - the maximum output difference at any point within the operating pressure range for
increasing and decreasing pressure.
5.
Maximum error band of the offset voltage and the error band of the span, relative to the 25°C reading.
6.
Maximum difference in output at any pressure with the operating pressure range and temperature within 0°C to +50°C after:
a) 1,000 temperature cycles, 0°C to +70°C
b) 1.5 million pressure cycles, 0 psi to full-scale span
7.
Input impedance is the impedance between pins 2 and 4.
8.
Output impedance is the impedance between pins 3 and 5.
9.
This is the common-mode voltage of the output arms (pins 3 and 5) for V
S
= 12 V
DC
.
10.
Response time for a 0 psi to full-scale span pressure step change, 10 % to 90 % rise time.
11.
Long term stability over a one year period.
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SCX...C Series
Low cost compensated pressure sensors
PHYSICAL DIMENSIONS
mass:
10 g
dimensions in inches (mm)
ORDERING INFORMATION
To order, use the following part number(s)
Description
0 to 1 psi differential/gage
0 to 5 psi differential/gage
0 to 15 psi absolute
0 to 15 psi differential/gage
0 to 30 psi absolute
0 to 30 psi differential/gage
0 to 100 psi absolute
0 to 100 psi differential/gage
0 to 150 psi differential/gage
Mounting Accessories
Description
Xmas tree clip
6-pin right angle socket
Pressure tubing clamp
Part Number
SCX01DNC
SCX05DNC
SCX15ANC
SCX15DNC
SCX30ANC
SCX30DNC
SCX100ANC
SCX100DNC
SCX150DNC
Part number
SCXCLIP
SCXCNCT
SCXSNP1
SenSym and Sensortechnics reserve the right to make changes to any products herein. SenSym and Sensortechnics do not assume any
liability arising out of the application or use of any product or circuit described herein, neither does it convey any license under its patent
rights nor the rights of others.
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Industrial Control Electronics
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